No, he replied, but it's curious you should mention it – I trod in some only yesterday.
Alas, a lot of avant-garde music of yesteryear is like the sci-fi of yesteryear – the vision of the future of the past. I get nostalgic listening to old time classics like Morton Subotnik's SilverApples of the Moon, which now seem as old as formica kitchens. Likewise the Helicopter Quartet, where each member of the string quartet plays from a helicopter hovering over the auditorium. I mean, puh-leeeuz!
Stimmung, though, has somehow survived all this. I still like it, and feel it hasn't lost any of its lustre with the passage of time. Perhaps because writing for human voices places constraints on a composer that are fundamental.
This is a truly remarkable live performance, with Ian Dearden (sound projection), Theatre of Voices directed by Paul Hillier. It was recorded on 2nd of August 2008.
In deference to Boom, I should add that this recording is mp3 at about 230kbs variable bit rate. And I've no idea of its provenance.
Download from Mediafire